Lindsay Lohan's new mug shot: in this booking photo from the Santa Monica Police Department. Photo:

Lindsay Lohan adamantly insists she was not trying to hit up the Hollywood scene just hours after she was ordered to undergo 90 days of lockdown rehab on Monday.

The troubled 26-year-old tweeted Tuesday, “Guys relax, that was NOT me at A/V or in the @mrpink SUV. I’m taking this seriously and focused on the road ahead.”

Lohan was allegedly seen arriving at the AV nightclub hiding under a blanket in the backseat of a car owned by her benefactor buddy, Mr. Pink. Upon noticing the shutterbugs at the venue, the vehicle did a 180 and left without anyone setting foot inside.

The actress continued on Twitter, “I stayed in last night, after a pretty long day…and ordered sushi to my hotel. Don’t believe EVERY little thing you hear, unless you hear it from me.”

Lohan, who got a new mug shot after accepting her plea deal, pleaded no contest Monday to reckless driving and lying to police who were investigating her crash along the Pacific Coast Highway in June. She was also found in violation of her probation from her jewelry theft case.